Cisco Security Advisory
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AV:N/AC:H/Au:N/C:N/I:N/A:C/E:F/RL:U/RC:C
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A vulnerability in the Cisco Nexus 1000V Virtual Ethernet Module (VEM) kernel driver for VMware ESXi could allow an unauthenticated, remote attacker to cause the ESXi hypervisor to crash, resulting in a purple screen of death (PSOD).
The vulnerability is due to insufficient validation of STUN protocol packets, which results in a crash of the ESXi hypervisor due to an out of bound array index access. An attacker could exploit this vulnerability by sending specially crafted STUN packets to a vulnerable VEM. This vulnerability requires that STUN protocol debugging be enabled on the VEM kernel driver for VMware ESXi.
Cisco would like to thank Felix 'FX' Lindner, Recurity Labs GmbH, for reporting this issue to us.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
To exploit this vulnerability, the attacker would likely need access to a trusted, internal network to send specially crafted STUN packets to a targeted device. This access restriction limits the possibility of a successful exploit.
Customers are advised to review the bug reports in the "Vendor Announcements" section for a current list of affected versions.
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Cisco has released a security notice for bug ID CSCud14825 at the following link: CVE-2013-1210
Vulnerable Products
At the time this alert was first published, Cisco NX-OS Software for Nexus 1000 Series 4.2(1)SV1(5.1) and prior is vulnerable. Later releases of Cisco NX-OS Software for Nexus 1000 Series may also be affected.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
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Software updates are not available.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2013-May-29
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